Friction shock-absorbing mechanism



Jan. 23, L923.

` S. B. HASELTINE.

FRlcTloN SHOCKABSORSING MECHANISM.

IIIIIIN` llllll l l l l Patented .llen ggg E@ nia-ire stares 2 litilyfiso i application filed may 2G, 1920. Serial 1,384,323.

1' of illinois, have invented a certain new and m'seful Aimprovement in Friction Shock-Absorbing Mechanism, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to improvements in friction shock absorbingmechanism.'

The object of the invention is to provide a friction shock absorbing mechanism of high capacity, elicient operation, long life and easy graduated action, the vshock absorbing mechanism being-especially adapted for rallway draft riggings.

ln the drawings forming a part of this specification, Figure 1 is a longitudinal horizontal sectional View of a portion of a railway draft rigging showing my improvements in connectiontherewith. Figure 2 is a vertical transverse sectional view taken lsubstantially on the line 2-2 of Figure 1. And Figure. 3 lis a top plan view of the shock absorbing mechanism proper.

In said drawing 10-10 denote channel shaped centervor draft sills of a railway car to the inner faces of which are secured front lugs 11 and rear lugs 12, the same being spaced the standard distance apart. A portion of a draw bar is indicated at 13, the same having riveted thereto a yoke 14 of well known form. The shock absorbing. mechanism proper and yoke are adapted to be supported by a detachable Vsaddle plate 15.

The improved shock absorbing mechanism, as shown, comprises, broadly, a heavy -spring cage or casing A; a front follower cage B, twin arranged main springs spring followers D--D; apa-ir of prehmlnary springs E-E; followers F -F; a central friction post or stem G; a pair of friction shoes H-H a pair of wedges .1 -J; and a pair of anti-friction rollers K-K.

The spring cage A is in the form of a heavy casting having top and bottomjwalls 16--16 and `an integral rear wall 17, the latter being adapted to act as the rear follower in conjunction with the stops 12. The friction stem or vost G is preferably formed integrally with t e springcage A and is extended forwardly of the wails 16 thereof, as clearly indicated in Figure 1. The details of the post G will be described hereinafter.

The post G is located centrally of the cage A so as to divide the latter, in effect, 5@

into two chambers suitableto accommodate the two main springs C-C in horizontal twin arrangement, as shown in Figure 1. The followers D-D bear against the front ends of the springs C, the rear ends of the G35 .springs bearing against 'the rear wail 17'.

Each of said followers D is of hollow cupshaped form so as to provide a. pocketv or recess to accommodate the preliminary springs E. ln addition, each follower D is provided with a rearwardly extended boss 18 arranged to extend within the inner coil of the corresponding main spring so as to maintain the follower D in proper position as will be understood. The followers F c bear against the front ends of the corresponding preliminary springs E and each of said followers F isof heavy disc-like form and so arranged4 that they are normally spaced from theforward edges 19 of 55)A the corresponding followers D, a` distance equal to the desired preliminary action, as hereinafter described. 'Said followers F overlap the edges of the flanges of the followers D soy as to actuatefthe latter after substantially concavo-concave cross `section as shown in Figure 2, that is, the stem is concaved on each side thereof symmetrically with respect to a -vertical central plane. Said concave surfaces indicated at `20 constitute longitudinally extending. friction surfaces and by making them asdescribed, it is evident that I obtain a relatively large wearing area considering the permissible vertical height of Vthe shock )absorbing mechanism which must be contained -within the arms of the oke. The friction shoes H are formed on t eir inner faces with correspondingly convex friction surfaces 21, each shoe being rovided at. its inner end with a transverse y extending .face 22 adapted' to 105 act as an abutmentagalnst the corresponding follower F. 0d its outer side, each shoe -H is provided with a wedge surface 23 and a roll shoulder or seat 24.

The follower cage is of generally rectangular outline and has upperand lower -walls 25-25 and side walls 26-26, the

latter being suitably braced on their outer sides by strengthening ribs 27-27. The upper and lower walls of said follower cage are curved inwardly as -indicatedat 28 to fit corresponding longitudinally extending grooves 29 in the upper and lower faces of the friction post G. In this manner, the proper alinement between the follower cage and friction post is maintained and also ample clearance is given for the two "retainer bolts 30-30 which pass through flanges 31 and'32 on ,the cage A and cage B, respectively, as clearly shown in Figure 3. As will be evident, the function of the bolts 30 is toyretain the rts in assembled relation and also, if deslred, to place the springs under an initial compression. The'interior of the follower cage B is made to accommodate the-two wedges J-J and preferably there will be inclined faces v33 on the inv terior of the cage to correspond with the plainly beveled ends 34 of the wedges J.

The wedges J are formed with wedge surfaces 35 parallel and opposed to the wedge surfaces 23 of the shoes, it being evident that the anti-friction rollers K are interposed between the sets of wedge surfaces 23 and 35. Each Awedge J Vis also-provided with a shoulder or roll seat 36 opposed'tthe corresponding shoulder 24 on the friction shoe. By making the wedges J separate or detachable from the cage B, the manufacturing costs are reduced and renewals may be effected at minimum expense. The inner edge of the cage B as indicated -at 37 is left for ward of the inner faces of the followers F vso as not to interfere with the follows F K to the shoes coming into contact with the followers D.

This is fully shown in Figure 1. Said edge, e

37 is however, made in alinement with t forward edges 38 of the top and bottom wall 16 of the spring cage A so that, upon completion ofthe permissible stroke, the cage B -will come into contact with thel cage A and a very strong column obtained for the transmission of the ultimate blows to the stops of the. rigging.

In operation and assuming a buiing movement, the follower cage B will move 'rearwardly thus forcing the wedges J rearwardly'in unison therewith. As the wedges J travel rearwardly pressure is transmitted therefrom throu h the anti-friction rollers y compressive stroke will be taken up in 'the come into engagement.

springs E and untilthe followers F and D l Thereafter, the main springs-C will afford the yielding reand they in turn are com-- sistance between the shoes H and the friction post or stem and spring cage. In release, due to the anti-friction rollers K, there will be sufficient motion between the'wedges J 'and shoes H as to vrelieve the latter of the enormous compressing forces that are set up during the compressive stroke and hence the release is m-ade certain. i

By employing the-curved sets of friction surfaces 20 and 21, it will be seen that variations o r irregularities in the inclination of the wedge surfaces 23 and 35 with Irespect to a vertical plane will be automatically compensated for since the shoes can adjust 4themselves circula-rl with respect to the stem or post G. This 1s of importance since it permits of reduced cost in the manufacture and eliminates some 4of the refinements ofV finishing that might otherwise be required.

- lIn this connection i't will be noted that there are no interitting ribs and grooves on the shoes and-posts to in anywise interfere with such shifting of the shoes circularly with respect to the friction post.

Although I have herein shown and described what I now consider the preferred manner of carrying out the invention, the same is merely illustrative and I contemplate all changes and modifications that come within the Iscopeof the claims appended hereto.

I claim: y 1. In a friction shock absorbing mechanism, the combination with a casing having spaced upper andlower, horizontal parallel Walls united by an integral transverse wall and a central partition .extending from said transverse wall between and` united to said parallel walls and outwardly beyond the free ends of the latter, said partition, at its extended outer end having friction surfaces thereon; yof friction shoes slidable on said surfaces; wedging means cooperable with said shoes to force them inwardly against said first named friction surfaces and longitudinally thereof; and horizontal twin arranged spring means for yieldingly resistingr movement between said shoesand said casing. i. V

2. In a friction shock absorbing mechanism; the combination with a casing having integrally formed spaced horizontal parallel topv and bottom walls, vertical end wall, and

la longitudinally extending centrally disposed partition dividing said casing into tw1n chambers, said partition being extended outwardly' beyond the .free ends of said top and bottom walls and formed with longltudmally extending friction surfacesg. a

Apair of springs longitudinally arranged in thesame horizontal pla-ne, and one of said springs in. each of said chambers; friction shoes cooperable with said friction surfaces and yleldingly resisted by said springs; and a wedge follower cooperable with said shoes 'spect to said casing.

to actuate them longitudinally with re- 3. In a friction shock absorbing mecha:- nism, the combination with a casing having integrallyY formed spaced parallel top and .bottom walls, vertical end wall, and a longitudinally extending centrally disposed partition dividing said casing into twin chambers, said partition being extended outwardly beyond the free ends of said top andbottom walls and formed with longitudinally extending friction surfaces; a longitudinally arranged' spring in each of said-chambers;

friction shoes cooperable .with said friction surfaces andl yieldingly resisted by saidsprings; and a, wedge follower cooperable limit the'. compression stroke of the'mechanis the casing acting as a column towithstan ultimate shocks.

4. ln a friction-shocl absorbing mecha-` nism, the combination with a'casing having integrally formedspaced parallel top and l tudinally extending centrally disposed partibottom walls, vertical end wall and a longitiondividing said casing into twin chambers, said partition being extended outwardly beyondthe' free ends of said tope'and-bottom -walls and formed with longitudinally extending friction surfaces; a longitudinally arranged spring ineach of said chambers;

friction shoes cooperable withsaid friction surfaces and' ieldingly lresisted by said springs; a we ge follower cooperable with said lshoes to actuate them longitudinally lower,

with-respect to said casing; and bolts extending between said casing and wedge follimiting the'. relative 'separation thereof. i

' 5. ln a friction .shock absorbing'mechanism, the combination with a casing having vspaced parallel walls united by an integral transverse wall and a central partition exstending from said transverse wall between and united to said parallel walls and outwardly beyond the free ends ofthe latter, -i 50 said partition, at its extended outer end,

y having a concavo-con'cave cross-section, the

surface slidably co-operable with a concave surface of said partition; wedging meansV i vcooperable with said shoes to force them` inwardlyl against said first named friction surfaces and longitudinally thereof; spring mieans arranged on opposite sides of said partitionr for yieldingly resisting movement between said shoes and said casing; and a wedge follower co-operable with said wedging means to actuate said wedging means and shoes longitudinally with respect to the casing, said follower substantially enclosing )the wedging means and friction shoes and adapted to engage the casing to limit the compression stroke of the mechanism.

l G. In a friction shock absorbing mechanism, the combination with a casing having spaced parallel. walls united by an integral ytransverse wall and a central partition extending from said transverse wall between and united to said parallel walls and outwardly beyondthe free ends of the latter,

said partition, at its extended outer end,

having a concavo-concave cross-section, t-lie concave faces forming friction surfaces thereon; of ,friction shoes co-operable with said partition, each shoe having a convex .surface slidably co-operable with a concave surface of said partition; wedging means comprisinlg a plurality of individual wedges co-operab e with said shoes to force them inwardly against said first named friction surfaces and longitudinally thereof; antifriction rollers interposed between the wedges and shoes; a main spring resistance; a preliminary spring resistance; followers interposed between said main and preliminary spring resistance; followers interposed between said preliminary spring resistance and said shoes,- the last 'named followers being normally spaced from the first named followers and adapted to engagethe latter upon compression ofthe preliminary spring resistance; and a wedge follower detachably receiving said Wedges and co-operable therewith to actuate said wedges and said shoes longitudinally 'with respect to the casing, said follower. substantially' enclosing the wedges and friction shoesand adapted to engage lthe casing to limit the compression stroke of the mechanism.

In witness that l claim the foregoing l have hereunto subscribed my name this 20th day oft/lay, 1920.

. STACY VB. HASELTINE.

Witness: i

CARRIE GAiLING. 

